I have had this before.
Roof wrote "The are just your normal plastic drums that you buy at the brew shop"....yep, we call them Vessels, Fermenters, Drums and many other things.....
Your beer will be OK over time, as long as the beer you racked/bottled, you tried not to get the white scum in the racking vessel.
When I do get this one, which is not too often, I pour boiling hot tap water in with Napisan in the infected fermenter and let it sit for an hour.
Open the tap and let some of the hot water flow through too. If you use "Boiling" water you may melt your plastic fermenter.
I then give it a good rub with a sponge inside, open tap again and let it go through some more, and give the tap and threads, keg thread too, a good going over.
Rinse and store.....or even better, sterilise, rinse and brew another batch.
Hope this helps,
A homebrew is like a fart, only the brewer thinks it's great.
Give me a flying headbutt.......