Most people use cold or cool water to wash now. I don't know any detergent that dissolves completely in cold water, not even liquid unless it diluted down. Turn your washer to hot wash and then check the water after it fills. Chances are good it will not be hot. The new washers have a temp control and if the water is above a certain temp the cold water is added. It's hard to get a true hot wash. When I want hot wash and bleach I tun off the cold faucet value to the washer. I have used the clean cycle on my oven at least once a month and the oven is almost 20 years old and working fine. I want a new one but I don't know how fragile the new ones are but I guess not made to be great for home use unless it's the $10,000 plus brands.