Hi Cheryl
Belguim Wiltons
can be wet cleaned you just have to be careful not to over wet , Dry Fusion or Texatherm would be the safest bet but I have HWE BW plenty of times with out any problems

As for other problem floor coverings where a dry blend is recommended, this would be the natural types such as, Sisal,Seagrass,Jute etc Cotton, some silks (rugs)although once again silk can also be wet cleaned after carrying out the usual checks.
If in doubt take the details and ask
first before attempting clean.You will soon come to recognise which carpets could potentialy cause a problem.