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Gtechniq W4 Citrus Foam is a pH neutral pre-wash snow foam that removes hard to shift grime, without damaging sealants, coatings or waxes.
W4 combines an effective citrus degreaser with a strong foaming agent making it tough on road grime and bug spatter but kind to waxes and coatings.
It can be used at a dilution of up to 1:400 through a foam lance, or up to 1:25 through a pump sprayer.