Be careful raising the temp on it's own, the reason people do this with whitespot is to speed up the life cycle of the protozoan nasties. If you don't put it high enough it will make things far worse, and if too high can obviously cause harm to some fish.
Generally the reason you want to speed up their cycle is because they can only be killed in one of the three stages of reproduction, so when used with a medication you are more likely to get them in a reasonable time.
Another tip, just because you can't see the white spots anymore does not mean things are now OK. The protozoa only stay in that form under the slime coat for one of the three stages, the two others you can not see as they are on the tank bottom and free floating ready to attack again. This is why white spot can seem to go and come back repeatedly.
I have heard salt works but myself I have always used Protozin from Waterlife. Works very well and doesn't harm your fish, I have used double dose (as instructed by waterlife) with clown loach and they have been fine.
Also I disagree with the comment of using table salt over aquarium salt. Most table salts contain an anti-caking agent which is bad. Having extra stuff in aquarium salt is not a bad thing, it is made to go in your aquarium after all! Just don't confuse this with the salt used for marine water as this very different.
