Success! Thanks, the crystals worked really well, removed all the older stains too.
Glad it worked out. I first came across the stuff when I needed to remove marks left in a toilet U bend by one of those bendy steel unblocking rods. Works on those too.
Thanks, got that issue at work actually.
@Sharkstar started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Success!
Thanks, the crystals worked really well, removed all the older stains too.