If it is hardwater spots, mix white vinegar with water 50/50. Put it on in the shade and scrub with a clean cloth. Also good for the shower and coffee pot 
"All right, they're on our left, they're on our right, they're in front of
us, they're behind us...they can't get away this time"
Lt Gen. Lewis B."Chesty" Puller, USMC
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