Man do I need a shower
 

Well, not yet anyway :)

I have scrolled through the forums and searched but I was not able to find the specific piece(s) of info I need.

Am flying SFO-ICN on OZ (discounted Y), connecting to ICN-BKK-DEL on TG (full C class) 3 hrs later, with a 6hr cxn in BKK. I have a RCC membership and am *Gold.

I will really want to take a shower - either in ICN or BKK - because I have to attend a dinner first thing upon touchdown in DEL. I believe there is an SQ lounge in ICN that has showers - will I be able to use it since I am not on any SQ flights? Does TG have a lounge in ICN and if not, do the Executive lounges in BKK have showers? I think only the First Class lounges there have the showers.

Since you're *G you can use either the SQ or the OZ lounges at ICN; both are extremely luxurious and well equipped (2 of the best lounges to be found anywhere across the *A network, in fact) including showers. I haven't used the SQ ones, but the OZ ones are like little mini hotel suites, very luxe.

As it happens, the TG lounge near the 30something gates at BKK (I think... the 2 storey one anyway) is another great lounge. It has showers too, and complimentary massages (enquire as soon as you arrive in the lounge, as you might have to wait).

You'll be spoiled for choice!

The SQ ICN lounge showers are also very nice.

The TG lounge in BKK near gates 50+ also has 2 shower rooms. Nice Thann toiletries.