What I've been doing is mixing about 1 part of liquid PVA with 10 parts water. I then heat up the 3D printer bed to the desired temperature (60C for PLA) and brush on the solution. I keep brushing the bed to spread the solution evenly until it dries out. At this point, the printer bed is ready for a new print.
Here's a comparison of the results.
Without PVA (there is a noticeable lift on one of the edges of the print):
With PVA (no lift on the edge):
The downside is that the printer bed needs to be cleaned after every single print or it will begin to accumulate layers of PVA.