I'll answer for what I do...
I sometimes use a chamois, but for the most part I loose it.
I don't spray water on my shorthairs, but I do comb them.
I just either use a metal comb for the longhairs, or a cheap comb from Wal*Mart or the dollar tree, nothing too expensive, because all in all it's a comb.
Yes, I usually bathe before shows... well it depends, I usually don't if the pig doesn't need a bath. I usually do it the night before a show.
Though a week before the show would be better.
I just use water, maybe some mineral oil, or something that will clean it.
For keeping white-white pigs white, I love to use Corn starch before bathing and then washing it off, and shampooing and conditioning the pig. But for the most part, it's genetics and how well the cage is clean! Whites should stay white on the underside even if the cage hasn't been cleaned yet... and if they have bad urine stains, it goes to show how dirty their cage is.
I don't have Teddies, but likewise, all breeds of cavies will need a bathe, but don't bathe the harsh coated breeds a week before the show! Wait at least 3 weeks.
Again, I don't really know about the flake problems on Teddies, since I do not have them at all.
Don't have Teddies, so I don't groom them, but I've had some before... use a lint roller, comb, and your hand, and hope that you don't look like a fur ball afterwards!
Can't groom them Texels, so I use a Spray Bottles, to mist them, and then use my hands to fluff the coat. And it has to be done daily, because they will get mats, trust me... and mats just aren't easy to get out.
My smooth hair longhairs get wrapped, unwrapped, combed, washed, and a lot of handling, so they tend to be real human savvy.
Nope, I don't risk using those sprays, because they are meant for pigs, and I don't want the kids to get sick, because I love them, and I'd be in tears if those sprays got them sick or killed them, since they are pretty strong.
And as for Shampoo... I use Mane N' Tail... love that stuff!
Condition- Mane N' Tail, and the blue, small bottle of Mane N' Tail for people works like wonders! But I haven't bathed the pigs for a bit, since show reason has been down, and now it's starting again... so I best better get my butt to the laundary room bathing pigs, oh-yea, and ordering some Revolution!