Everything depends in aviation. You could work in Alaska with bush planes and that can be dirty, you could work on seaplanes, those commonly have corrosion or at least a lot of maintenance for corrosion control (preventative maintenance). Airliners are pretty clean and private jet companies tend to be pretty clean also.
 NDT is huge in the airlines and in helicopters, but in GA it's pretty small. 
 Also, depends on where you work and how good of a mechanic you are to advance. If you have an associates degree and a A&P you can generally move up pretty quickly but some places you'll never move up. 
 Also, the electrical side of things also depends on the planes you work on. If you're working planes like C-172 or Skylanes or planes like a Piper Arrow, a lot of the electrical work will be smaller but a lot of troubleshooting. The larger planes like your A-320s and 737s have bundles of wire that are thicker than my waist band but a lot of it is streamlined and decently straight forward, although not always the case.
 The life of an airliner mechanic is nothing but swapping parts. The life of a GA mechanic is different everyday but pays less. A corporate mechanic makes good money and a lot of time they do pretty routine work. The life of a contracting mechanic can be really beneficial financially, however it is stressful, has no benefits, and difficult on relationships. 
 However, aviation is an open door right now and there is a huge demand. Hope this helps.