|Type of Stain
|Suggested Removal Method
|Moss, Fungi and Mould
|Dry brushing with or without application of clean sharp sand. OR High pressure water jetting with or without detergent. OR Apply fungicides.
|Leaf Mould & Wood Rot
|Use ordinary bleach or calcium chloride followed by sodium hypochlorite dissolved in water (1kg in 5 litres) then scrub with stiff brush.
|Use ordinary bleach then scrub with stiff brush.
|Tomato Sauce, Mustard & Oil
|Apply undiluted liquid detergent for 15–30 minutes, then scrub and wash with hot water.
|Scrape off excess material and apply poultice of methylated spirit.
|Scrub using stiff brush with aid of water, detergent and scoring powder or sharp sand.
|Oil or Vehicle Grease
|Apply dry absorbents such as Fullers earth, talc, diatomaceous earth or kitty litter for at least 24 hours to remove excess oil, then sweep up.
|Scrape off excess paint, apply paint remover for 15 to 30 minutes, loosen with gentle scrubbing and absorb loosened material with paper or cloth. Do not rub.
|Cover with clean damp sand. Sweep off with stiff broom. Repeat as necessary. Apply clean dry sand and allow to dry.
|Remove lumps of hardened material by chiselling, scraping or grinding. Wet surface & apply dilute hydrochloric acid (1 part acid to 20 parts of water) & scrub vigorously for 2–3 minutes. Thoroughly hose down immediately after scrubbing.
|Scrape off lumps then scrub with hot water and strong detergent.
|Scrub with poultice of talc and bleach diluted in water (1:5) & wash with water.
|Refer to Section 2 of this Document.