Depends on the car . . .
Some front wheel drive cars can be very easy to change clutches on, like the old Saab 99 and 900 cars. Others are more difficult. Some rear drive cars are difficult too - for many years Jaguar was famous for requiring engine removal to do a clutch job, and their six cylinder engines were heavier than most American V8s.
I'd be careful about too many steam cleanings on a modern car. If the technician isn't careful or doesn't know the particular model well he can easily put too much steam into areas with critical electrical connections. Wet connections promote corrosion - this is why manufacturers protect them with little rubber booties. When the car gets older the booties can degrade and in any event they're not intended to take strong blasts of steam. Just one poor connection on a computer controlled car can cause all sorts of hard to diagnose issues ranging from check engine lights to stalling, so it pays to be careful.
Sudsmaster: I'd say $1300 to rebuild an automatic tranny is a gift! About ten years ago the automatic in my mother's Eagle bit the dust just after the seven year warranty expired, even with less than 70,000 miles. I think she ended out paying around $2500 for a rebuild; the dealer wanted $5000 for a factory rebuild, not including installation. VW gets about the same today for a rebuilt automatic, again not including installation. BTW I thought of you yesteday when I saw a really lovely black late '40s Dodge business coupe in Santa Monica. It was parked at a meter, appropriately in a business area, so it must be in at least limited use.