30 dollars in and out sounds like a fair price. Depends also how often you are doing it as well.
My video sadly is still uploading because I am uploading on a very slow data hotspot. However, know your worth. Say you want to become worth 40 dollars per hour, you may charge based on per pane but at the very least figure out how long a store may take you to clean. If it takes you 15 minutes, charge 10 dollars, 30 minutes, charge 20 dollars. If it takes you 45 minutes, charge 30, if an hour, charge 40. If you want to trade time in for money, make sure you price your time for no less than your worth.
However, you don’t have to use that example. Maybe you want to be worth 60, or maybe more. If you start to have operations done for you, you may need to charge way more. Maybe you charge 80 dollars per hour, but you have 1 guy you pay 15 dollars per hour. Lets say you also take out 30% tax as well if you are becoming official. So after 1 hour of work, lets say 24 dollars was taken out for 30% tax, then you pay your guy 15 for the hour. So 39 dollars out of 80 leaves you 41 dollars per hour for work you didn’t have to do.
If you want to trade no time for any amount of money, it will take work but you could start making a passive income easily. After you get 41/hr, if you have enough work to justify that, maybe you have 10 guys doing that and 800 dollars worth of work you set up, you start paying them all and tax, now you are making hundreds per hour without doing anything.
Trading time in for money on a linear income needs to be worth it, nothing less. However it can be very limiting after some time, with passive income or trading no time for any amount of money, the sky is the limit.