I did use one for the longest time, rinsing in hot water before use. Can't say I ever saw a scratch but I always figured it was only a matter of time so stopped a few years ago. Generally now just wipe down the back with a paper towel as others have suggested and hang to dry over the bath after running hot water through the shower head for a few mins to let the steam knock down most of the dust. Door shut and no disturbance for as long as practical. More recently, once it/they are hanging up, I also give a zap with the Zerostat I bought myself for Christmas...
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