I have used wicks patio cleaner (cheaper the better) Spray on neat agitate with a brush and rinse off with plenty of fresh clean water. Even takes off very old brake dust.
Have found it to be as good as G101
It Contains the same chemicals that tyre garages use to clean wheels up.
Cheers Glenn
Disclaimer. for info only Use at your own risk
Have found it to be as good as G101
It Contains the same chemicals that tyre garages use to clean wheels up.
Cheers Glenn
Disclaimer. for info only Use at your own risk

Brian
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