I've never cleaned one before until this fall. I just put all the smalls in a pan of varsol, went to work on the barrel/receiver with varsol, rags, acid brush over the garbage can and just took my time. The sludge dissolved off the parts in the tray by then and they didn't need much more attention. The stock I just wiped with varsol on a rag. I don't know how clean it is, but how much goop is varnished wood going to absorb? Afterwards I blasted out the interior of the bolt with brake cleaner so that it was nice and clean and dry and the firing pin rattled freely.
Honestly the most annoying parts were inside the barrel and gas tube. I tried hot water, but it just made a mess out of things. Just used various sizes of cleaning rods and varsol soaked patches.
But all of that aside, from stripping it down to putting it back together, all at a very unhurried pace and taking a few breaks, it still didn't take an evening.