The right answer is no .
No, saddles do not need to be washed after each ride ,if you are riding with a pad, the pad should be washed after a coulple of uses depending on how sweaty the pad is. If the saddle gets sweat or water on it then yes wash it with, saddle soap, the rinse it then put conditioner or moisturizer on it.
Yes, they should.
yes
Yes you can.
yes
Yes. Most traditionally shaped bicycles use a saddle to support (part of) the rider's weight.
Yes with every use they should be washed.
uhh...yeah...yes you can....thats the kind of saddle you use for many western activities ie. barrel racing, cutting, roping.
yes it can be washed.
No, it's a cleaner with some conditioning properties. It will not work as a resist, sorry.
lol yes, as long as they're washed REALLY well. It wouldn't hurt to use a disinfectant in the water :)
it is possible, yes of course. but it is a better idea to use an all-purpose, western, or stock if possible. i occasionally use my jumping saddle in trail rides if i am planning to do a lot of challenging jumping when i am out.