Just some questions to someone who may have the Aldi Ultrasonic Cleaner, we picked one up this morning and have put in a few coins found on the beach, using water with a couple of drops of detergent and they have had possibly a total of about 10 minutes to breaks to cool, at this stage not a great deal has happened, the water has gone very slightly brown and there is small amount of residue on the bottom of the cleaner, but none of the coins look much different, how long do they normally get left if they are not badly marked, these are mostly ones that have been in the sand for some time and lost their shine. One 5 cent coin has a dark film over it, but nothing seems to be happening with it.
Graham