It's much easier if you have a newly refurbished interior/new aircraft to maintain that condition after every flight, than to try and periodically "deep-clean" it back to health again. Act like the boss's new aeroplane is YOUR new car......you'll definitely be helping the F/A to do the polishing then!
My rule was that we all have to live and work in the same aluminium tube, so we all have a collective responsibility to look after it, cabin AND flight crew (and engineers too). It is always easier to keep the a/c looking 100% than to maintain it at say 98%, which looks just the same as 97% or 96% etc. Set the highest standard, and be disappointed when YOUR workplace fails to achieve it.