I have a question while we're on the topic...
I have both of the aforementioned Caig products. What's the best order? I'm thinking Deoxit and then Pro Gold?
Yes, if you are married to using those products.
I own both the Caig DeoxIT and ProGold products. I use DeoxIT on medium to heavily oxidized tube pins, and initially on untreated but used ICs, RCAs and RCA connectors, speaker cable banana-spades-prongs / intra-speaker & amp-speaker cable connectors, IECs, and PCs. From my experience it seems the DeoxIT pen delivery system works quite well for some things, and the spray is the more efficacious treatment for other items.
However, I hardly ever use ProGold anymore. I find that Walker SST is
much better in my system with my gear to my ears.

[NOTE: Use maximum care in applying the Walker product; FYI - works great on phono cartridge and tube pins!] I can plug and unplug the Walker treated connectors / etc a number of times before having to reapply the SST. The only use ProGold currently gets is for my headphone system's IC plugs / IC connectors, and 1/4" headphone plug / 1/4"-to-1/8" plug adaptor. YMMV.
FYI: ProGold's name was changed in 2006 to
DeoxIT Gold.