The VAX computers from digital have a very seriouse problem with its feet.
The rubber in them dissolves and starts to melt away. All of my vaxstations have this problem.
In one case it became so serious that i had to turn the vax upside down and scrape
away the ramains of the feet with a knife and the clean off the rest with alcohol.
Picture showing a vax that has been underneath another thus beeing soiled down by the melting feet from the above vax.
Beware. it gets on clothes and is very hard to clean off
This is what your vaxes will look like after a couple of years if you stack them
Comparison between 2 vax feet, the one to the left is almost completely revulcanised
these are from the VAXstation 4000