T-maps are probably among the best for the basic imbuing resources (Magical residue, Enchanted essence & Relic fragments) in general. you take an extra container fill it with the items in the chest you don't want, and take the box containing the garbage items back to your house to unravel. with a decent chance of coming across usable loot, but it does depends on how fast you can knock out the T-maps though as far as relics/hour go.
if you're doing mutli-account farming, same deal... bring an extra container, put it on the ground near the corpse filling it with everything you don't want to keep, and unravel it when you leave.
plus it makes it much easier to sort through the loot when you remove anything you've already looked at. especially when you multi-client bosses and you have a time limit to loot the items before it decays, generally you're going to run through heaps of garbage items before finding anything good so the time it saves is valuable.