Have mentioned in a few other posts my SWG cell builds up calcium deposit quite quickly (the pool CH level has generally been high - on the pool shop results so grain of salt!). Anyway, I normally use a 1:8 solution of water & muriatic acid and sit it in there to clean it. Often in spots there is still clumps of calcium particularly at the edges of the plastic frame.
I had a thought of using a wooden long skewer to nudge off the calcium, especially just after sitting it in the acid when the calcium is much easier to loosen, would this be ok? I know anything metal would damage the plates but the wooden skewer should be harmless?