Hi,
Not a trail related question but I'm hoping I can tap into the general bike knowledge of members - my son has parked his bike in an underground car park and found that water has leaked off the stone roof and stained the tank of the bike with what looks like some kind of lime. He's tried to clean it off with Muc Off and WD 40, but has made no impression on it. Short of getting the tank resprayed, has anyone out ther got any ideas what he could try to shift the staining??
Many thanks, Kite, Oxfordshire.
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