I put the Tufo(off white) strap on my Panda about 4 months ago and have put it through everything. No issues with dirt or discoloration and everything kind of wipes right off. In the early days of rubber straps(20 years or so ago) especially with white colors there was this really weird phenomenon of being able to wipe dirt and dinginess off 2 or 3 times then it was kind of forever in the strap. Not so with most modern straps. Just passing along my experience thus far.