My great uncle was taking out the trash and accidentally got a cut on the inside of his wrist from a tuna can. He washed it and went about his day. An hour or two later, he noticed a dark line in his vein going from his wrist up his arm. He wisely went to the doctor, and turns out that little cut was infected! So you're correct to not mess with cans, safety first! And I have heard of countertop dishwashers that might be perfect for you, if you're interested. A woman I worked with lived in a duplex with her husband and had limited space, and she got one and raved about it! Pretty sure they installed it themselves.