i have a silverstone M3 and just spray washing at the stall for $6 gets it nearly as good as spending a ton of time handwashing and drying at home. It hides dirt, swirls, water spots really well.
My GT3 i'll hand wash once or twice a year. its chalk and doesn't show much dirt either.
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2018 Porsche GT3 6MT
2021 M2C DCT
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