I've just had a thought, if your friend only works part time, say Saturday and Sunday (busy times for car washing) Between the hours of 9am and 5pm British gas are constantly advertising now that they will provide you with FREE I'll repeat that FREE gas and electricity between these hours and on these particular days
Thereby saving you money on the cat, mouse, wheel and dynamo..... Give them a call and let me know how you get on.....and how much it is going to cost you for this FREE gas and electricity....... 