*** A long(ish) thread but please stick with me on this one! ***
*** Pics had to be changed to links because they are too large - Please click the link to see the photo in question! ***
I have only completed one brew (currently conditioning in bottles as we speak) and have used my bottling bucket twice. After both uses I thoroughly unscrewed the tap, separated the nut and washer from the tap and gave all components (including the bucket itself!) a quick clean in PBW, rinsed and left to air-dry. Before next use I use StarSan solution.
I'm in the process of preparing a dip tube for the tap (separate story) and last night I was handling the tap while working out what components would be best. While doing this I noticed on the bottom of the tap a brown 'smudge'. It did not wipe away when I put my finger inside the tap. A quick inspection showed the tap assembly is in two parts and at some stage some gunk had got inbetween these parts. See photograph of the tap below (gunk is barely visible, about halfway up the tap body above the plastic marking):
http://i.imgur.com/w0aUkta.jpg
This morning I, with a bit of brute force, separated the tap into its individual parts. See photograph below:
http://i.imgur.com/sdnbQ7t.jpg
Here is a close up of the gunk:
http://i.imgur.com/91vlRqj.jpg
http://i.imgur.com/S5wE97E.jpg
I've done some research this morning and apparently the body of the tap is in two parts so that the tap can be rotated in-situ.
So, I have a few questions:
1) Is it normal to have to strip down a tap to this level? This minor build up was after only two uses!
2) Does this affect the life of the tap?
3) There appears to be some sort of grease between the two parts of the tap - I assume to form a good seal. In wiping the gunk away this grease has been removed. Is it necessary to re-grease? And if so, what product can I use? I imagine Vaseline is not food grade?
Relevant, but secondary questions:
4) I use the wideneck wine fermenter tap (Waddington and Duval) on my fermenter (photograph follows). Does anybody know if this separates in a similar way? Below it's solid black in colour it's not possible to see any gunk build up and likewise it's hard to see how the tap is constructed to know whether it can be separated or not.
5) As the bottling bucket tap, I clean the tap body, washer and nut separately in PBW, rinse and use StarSan before use - Is anything necessary beyond this on the W&D style tap?

Thank you so much for your help - Please do add any comments you have as I'm currently a bit apprehensive about starting my next brew until I'm sure these are sanitary - I would not want an infection in only my second brew!