for something that works and not so harsh on your clothes, try spraying Hydrogen Peroxide on the stain and a toothbrush if needed. Let the Hydrogen Peroxide sit for a few minutes.
Hydrogen Peroxide is a whitener for teeth after all, so it is strong enough to get stains out, but not so harsh. Good luck
I live in California where everything is over-priced so I probably won't be much help as far as what to charge, certainly do not charge by the hour you will never make any money, but then again I'm not sure where you live or how fast or slow you work. If you want to take your time, then charge by the hour.
Here are some things to consider - travel time and what that will cost you. Who is providing the cleaning supplies? How much will that cost you. You probably want to provide cleaning supplies or see if the supplies you will have are sufficient and to your liking. You can spend a lot of time cleaning with cheap supplies (good if you are charging by the hour)
EXAMPLE he says DEEP CLEAN - that means it's probably really dirty and do yourself a favor and make sure you have some TILEX or something good for cleaning bathrooms, etc. and bring GLOVES.
Hope this helps you have a better experience, cleaning some else's house sounds easy, but when someone says deep clean, it's probably really gross. Don't forget the gloves. LOL Have fun
Try this if you prefer not to use water, after all water is a big part of the problem, isn't it? LOL. Spray Hydrogen Peroxide then spread some baking soda over it and let it sit for a little while Then spread some kitty litter (absorbent works better) to help sweep up, kitty litter may not work as well as an absorbent but it's a lot cheaper and helps it sweep up nicely.
FYI - I do live in California so water is not to be wasted but even if water is not an issue for you, this helps to keep the yucky stuff contained. Good luck