I still use plastic buckets (all three are about 2 years old now) with spigots, and all I do after racking the beer out is give it a good rinse with the hottest water from my bathtub tap (a shower head on a hose works great if you're like me and don't have a laundry sink), use a soft sponge to make sure the krausen ring is gone, rinse again, and leave it to dry. The spigots get disassembled and live in a big mason jar full of starsan solution. And I don't use soap to clean my buckets, just good clean hot water. All three of them smell like beer but I don't care. If I've been lazy and let the fermenter sit a day or two after kegging I'll rinse it out then let it soak for a few hours, once again just with water. On brew day another rinse with hot water, install the spigot, let cool, then fill with fresh sanitizer. Good to go and no infections.