A4 Avant TDI S-Line Issues

Just purchased a 56 plate s-line and have noticed a few issues.

1. There seems to be a bit of greyish smoke when i put my footdown, it doesn't seem to be that much or a thick cloud but definately noticeable.
Mine is the pd170 and think it has the dpf? This should stop any exhaust diesel particles shouldn't it? The turbo was replaced by previous owner using a specialist so hoping its not that going!
I need to give the car a good run and try regenerate the dpf, do you just drive at around 2.5k revs for 20mins to do this?

2. My rear washer isn't working (avant model).

3. My front headlight washer doesn't fully reclose and stays open by about 10mm and needs pushing back in. I had a quick search on google, some needed a new bumper altogether and some just required some penetrating spray to free up the mechanism (really hope this will solve it!).

4. When i turn the key in the ignition there are 3 warning bleeps. The dash doesn't show any warning symbols at all and the car seems to run fine. When i spoke to Audi they believe it may be an alarm remote battery getting low?

Any advice on any of these points will be much appreciated. Im new to owning an Audi (and a diesel) so don't have a great deal of knowledge!

Ta, Chris

Thanks will have a check! Does the pipe run behind the n/s arch and under both doors along the sill?

Should i be looking behind the covers in the boot space?

Thanks for the help. Where does the line run exactly? Should be having a look at this tomorrow! Will make sure its not leaking onto the amp!

Is it possibly the jet is just corroded and not letting screenwash out?