Hydro-Force Viper Renew 3.8ltr Kleenrite It is the most common

It is the most common cause by a wide margin

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The other symptoms are a trigger that has gone heavy or notchy

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Hydro-Force Viper Renew 3.8ltr Kleenrite It is the most commonUse Viper Renew when all other cleaners have failed. It works on the acid side of the pH scale removing soils and stains on grout, tile, and stone that have been neglected for years. Viper Renew actually removes a very thin layer of grout, taking with it all hard water deposits, soap scum, and efflorescence. The proprietary organic salt in Viper Renew is twice as effective as phosphoric acid at dissolving calcium carbonate and without unpleasant