Is my bike getting ruined? I have a 2015 Giant Trance that is about 3 weeks old. Used pretty much every weekend. It's kept in a shed (fully covered,  no insulation just a regular shed), after every ride I give it a nice clean with a hose lightly over top, use an air compressor then use a micro fiber cloth to dry down and tidy up. My bolts, chain and discs for my brakes seem to have a lot of rust on them for 3 weeks old.

I have 2 questions:


Is this rust bad for my bike and if so, how do I remove it?
Is cleaning it with a hose, using the air compressor then the cloth bad for the bike and maybe making it rust?


Sorry if this is hard to understand, feel free to ask questions to know more.
Thanks!

P.S. Where I am from there is a lot of sulphur in the air (it's bad enough people visiting smell it very easily) so maybe that could be apart of it? It's also summer (southern hemisphere) and our trails are mainly in the trees, with the occasional tracks where trees have been cut down. Hope this helps.
Chain will rust always after washing (or even light rain or a puddle of water), if not re-lubed. I think this is detrimental to the chain, as it removes material from the rollers and thus contributes to chain stretch.

Bolts for stem, handlebars etc. seem to always like to rust after rain or washing. I don't think it is a big deal, but it ruins the look of the bike. How I solve this is put a small amount of grease at the bottom of the bolt head (and then wipe any excess). The grease seals the hollow head and stops rust. Using a hex on the bolt removes most of the grease, so re-lubing after repairs is nice.

About the disc brake rotors - this surprises me. Apart from two general advices, I can't see how can I help with this. Firstly, after washing a bike, lift it up several times and force it into the ground - this should should shake a lot of water off. Secondly, after that, you can make a couple of hard stops - the disk pads will dry the disks in no time.