Always refer to your manufacturer’s warranty for cleaning instructions. Each fiber has different characteristics. Improper cleaning is one of the leading causes of damage to carpet fiber.

It is better to remove the existing vinyl, but if it does not cause a transition problem from one floor to the next and/or if it does not cause a problem with the installation or removal of appliances and doors then it can be done. Keep in mind though that you may want to remove and raise your base boards so they have the proper reveal.

We generally recommend that the underlayment be removed because the subfloor may not be adequate to support tile. However, if your existing vinyl floor was installed over an adequate subfloor using a full spread installation method then yes, it can be done if you use the proper installation products.