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Thanks for reply. I haven't got one, I stayed at a holiday home last weekend and it had a slimline dishwasher. I put an ordinary tablet in and soapy water oozed from the bottom of it. I didn't use it after that, but I guess there was too much detergent in the tablet.
I have a full-size DW at the moment (not the husband, lol) but there are usually only two of us at home, and we are looking to move house soon, so I am thinking about getting a smaller dishwasher when we move.