Re: Should my prewash be cold or hot?
You will get a lot of different opinions on this. I do my first wash on warm, second wash on hot.
If I had any other dirty laundry (even just towels) I would not bother with a cold wash. When I am washing dishes, I don't soak or rinse them in cold water, I use warm or hot.
You may have to experiment; I have had better success using a warm first wash then when I was doing a cold first wash.
The argument is that cold water won't set stains, but I have not had any stains since I started using warm water.
I researched the cost difference between using warm or cold water, it was not much difference. I forget what it was but it was so small that I decided it was worth giving a try.