Why not put an advert up at your local flying club(s) offering to wash and clean aircraft. You might get some takers. You might have to do it for very little money but if you get known for doing a careful, thorough and reliable job then the word will get around and there might also be some free flights.
Once you get known for being reliable then who knows what else you might get asked to do.
This should fit in with working at a hotel to pay the bills.
The biggest problem is deciding to do it!!
Good luck
ZA