  Interfacing graphene with solid-state devices and maintaining it free of
contamination is a crucial step towards a functioning device, be it a
semiconductor structure or any other device for technological applications. We
take advantage of the catalytic properties of platinum metals to completely
remove the polymer capping after the transfer of macroscopic graphene sheets to
a solid-state device. For that purpose a platinum metal coated structure is
brought in close proximity with the polymer capping. Subsequent annealing in
air at a temperature between 175 and 350{\deg}C actuates a complete catalytic
removal of the polymer. Finally, the platinum metal catalyst is removed
revealing ultra clean graphene interfaced with an arbitrary device. Experiments
to interface macroscopic graphene layers with oxidized silicon wafers
demonstrate the general applicability of this approach. In repeating the
procedure, multi-layer graphene sheets can also be produced. Direct evidence
for the latter is provided by optical images of three overlapping graphene
sheets. The exceeding level of cleanliness of the graphene is examined on the
nanometer scale by means of low-energy electron transmission microscopy.
