Best Patio & Decking — Chemical Treatment (2026)
1 patio & decking matching material “Chemical Treatment”, hand-picked from UK Amazon listings.
£17.99
Pros
- Removes dirt, algae and mildew to restore decking colour
- Opens wood pores ready for oil or stain
- Covers up to 25 square metres per 5L
Cons
- Needs a stiff brush and rinsing for best results