In my opinion, the only cleaning a mash tun needs is to remove debris. My tun is nice and brown and full of scratches from well over a decade of brewing. As long as you are rinsing the tun out well and removing sugars and other materials that might putrify, there is no need to disassemble or radically clean anything.
I always run a ton of hot water through the spigot and clean the tun thoroughly. My question came about because I had a chemist friend over and she made me leery about what might start to grow in the crevices of the copper fittings. Being a semi-lazy brewer, I would much rather not have to disassemble anything. Thanks for the response!
By the way, I am from Carmel, too. I'll have to look up Foam Blowers soon.