My method is to ride them until they look grim, or start to hernia inner tube, then put them in the shed whilst googling “skin/amber” tyres and weighing up the balance between postage from Germany vs buying tyres with massive logos on the side.
Then, and this is the important bit, drink one or two martinis before persuading yourself that a pair of black Schwalbe-Kevlar-addix-Continental-speed-kings is prolly a better bet because smoke darts were always sketchy anyway......
Saves on fairy liquid and dishwasher wear and tear.