10 Best Stain Block Spray Wilko for 2025

Buysmart Products Ltd

• Kills green algae, mould & Lichen on hard surfaces
• 9-1 Super Concentrate - makes 50 litres
• Spray & go - no pressure washing, scrubbing or rinsing required
• Biodegradable, no acid or bleach, children & pets need not be excluded from treated area once dry
• Treats up to 250 square metres and is effective for up to 9 months

Pro-Kleen

• Simply Spray & Walk Away by Pro-Kleen is a super powerful outdoor green mould and algae removing solution – the intense cleaning fluid revives your patio, decking, fencing, outdoor furniture, and so much more and is safe for children and pets once dry!
• For super quick results in cases of severe mould and algae, you can use it neat. With more active ingredient than most other outdoor cleaning fluids, Simply Spray & Walk Away really is the better way to clean and revive your outdoor area (with hardly any effort required at all)! This concentrated patio cleaner fluid is all you need to keep your garden looking clean all year round and 5 litres of solution makes up to 25 LITRES!
• Safe for use on all outdoor hard surfaces including driveways, patios, fencing, roofs, uPVC windows, boats, caravans, motor homes, sheds, decking, and anywhere green mould and algae forms. You’ll see results in a few days that last for months.
• This outdoor cleaning solution is super easy to use! Simply mix 1 litre of Simply Spray & Walk Away with 4 litres of water - (or 1 part solution with 4 parts water), spray on with your low pressure garden sprayer or watering can then walk away, forget about it, and the green stuff will be gone within a few days! This powerful cleaning solution even helps to prevent the regrowth of mould and algae for up to 6 MONTHS!
• No pressure washer needed ✓ Super concentrate ✓ Non-acidic ✓ Non caustic ✓ No bleach ✓ No shelf life ✓ Biodegradable pH8 ✓ Children and pet safe once dry ✓

Jarder

• ✓ CLEANS WITH NO EFFORT: Jarder Spray And Leave Kills All Green Mould Moss & Algae With Ease, Without The Need For Scrubbing Or Pressure Washing! Simply Mix, Spray & Walk Away - Works Like Magic!
• ✓ SUPER CONCENTRATE: One 5 Litre Bottle Of Jarder Spray & Leave Makes A Minimum Of 30 Litres Of Solution Covering A Huge 240m² Area - Jarder Spray & Leave Is a Maximum Strength Super Concentrate Boasting 50% More Active Ingredient Than Other Brands!
• ✓ ALL HARD SURFACES: Perfect For Use On Patios, Decking, Fencing, Paths, Driveways, Roofs, Sheds, Greenhouses, Garden Statues, Terracotta Pots, UPVC Windows, Boats, Caravans, Motor Homes And All Indoor & Outdoor Hard Surfaces Affected By Moss, Mould and Algae.
• ✓ PREVENTS REGROWTH: Once Treated Results Will Show In 2-3 Days. Spray & Leave Penetrates Your Outdoor Surfaces Creating An Invisible Barrier Which Will Help To Prevent Re-Growth For Up To Six Months!
• ✓ 100% SAFE & GUARANTEED RESULTS: Biodegradable PH8; Non-Caustic, No Acid & No Bleach! Jarder Spray & Leave Is Totally Safe For Children & Pets Once The Area Is Dried. Prepare To Be Amazed! FOR VALUE PACKS SEARCH: JARDER SPRAY AND LEAVE

Dirtbusters

• Extra Strong Formula
• For Patios Decking Fences Sheds Paths Upvc And Most Surfaces Removes Mould Mildew Liched Algae Moss
• Mix 1 part concentrate to 4 parts water and apply by garden sprayer.
• Professional commercial strength product. No Bleach Or Acids and Biodegradable Watch It Work Over The Next Couple Of Days After Application
• No need to jet wash or brush after application.Safe for children and pets once dry

Pro-Kleen

• The best-selling Simply Spray & Walk Away is now available in a ready to use formula!
• Ideal for outdoor and indoor surfaces including patios, fencing, roofs, upvc windows, boats, caravans, motor homes, sheds, decking and driveways and most outdoor surfaces
• Non-acidic, contains no bleach, no shelf life, biodegradable and children and pets need not be excluded from treated areas (once dry)
• Retreatment may be required on heavily affected areas
• For best results and optimum coverage, spray on with a low pressure garden sprayer then walk away! Start to see results in a few days that last for months..

Safeguard Europe Ltd

• Clears biological growth
• Recommended preparation for Stormdry Masonry Protection Cream
• Apply using, brush, roller, or spray
• Ready for use (no mixing)
• Low odour, non-staining, non-flammable

Pro-Kleen

• Simply Spray & Walk Away by Pro-Kleen is a super powerful outdoor green mould and algae removing solution – the intense cleaning fluid revives your patio, decking, fencing, outdoor furniture, and so much more and is safe for children and pets once dry!
• With more active ingredient than most other outdoor cleaning fluids, Simply Spray & Walk Away really is the better way to clean and revive your outdoor area (with hardly any effort required at all)! This concentrated patio cleaner fluid is all you need to keep your garden looking clean all year round and 5 litres of solution makes up to 25 LITRES!
• Safe for use on all outdoor hard surfaces including driveways, patios, fencing, roofs, uPVC windows, boats, caravans, motor homes, sheds, decking, and anywhere green mould and algae forms. You’ll see results in a few days that last for months.
• Item package may slightly vary
• No pressure washer needed ✓ Super concentrate ✓ Non-acidic ✓ Non caustic ✓ No bleach ✓ No shelf life ✓ Biodegradable pH8 ✓ Children and pet safe once dry ✓

Sika

• Fast acting
• No need for washing or scrubbing after application
• Powerful fast acting formula
• HSE 9780 (super concentrate) HSE 9625 (concentrate) allowing sale in UK
• PCS Number 97716 (super concentrate) 97715 (concentrate) allowing sale in Ireland

Rust-Oleum

• Available in 42 attractive colours
• Available in a range of gloss, satin and matt finishes
• High quality, fast-drying formulation
• Smooth, durable finish
• Interior and exterior use

Pro-Kleen

• An extremely powerful formula for deeply cleaning patios and driveways
• Thoroughly cleans and powers through stubborn dirt and grime and even removes black stains
• Use on block paving, concrete flags, steps, paths and more
• Even works on areas that have been neglected for years
• Can be applied with either a watering can or pump sprayer