Got some Purge the other day to try out after using autosmart's fallout remover for the last few years and have to say yet again Anachem have nailed it
I get that the colour reaction is just a material element but there's no doubt it helps you realise how bad the iron fallout is and how well the product is reacting with it. Another plus point is this stuff is more syrupy so I felt I needed less as it clung to the wheels more compared to more liquidy stuff I previously used.
I had a quick go at my wheels for a quick try and scrubbed the tyres with Purge and all I can say is Tyres came up like brand new and removed most of the in ground deposits on the alloys with just a power hose.
At another point I'll take the wheels off and do inside fully, wheel arches and round the car in general, but here's some pics of the results (and also of the car just to show off the work of Hybrid and Ultraslick).
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That Golf looks in great condition