Best Parkett cleaning products & tips?

We have a varnished (versiegelt) Parkett which was done new about 2 years ago and it marks like crazy (sneaker marks etc).

I am starting to have my doubts whether it was properly finished but am no expert and will not change the situation now....

So am wondering if anyone has tips on the best products to use, whether cleaning stuff or mops. I want to try and sort it myself as it's driving me a little crazy to see all the marks

Edit - currently am using Wega Parkett cleaner and Vileda mop.