Dirty keyboards and PCs are the result of hard working staff. Like your kitchen, which only stays clean if you don't cook in it, your desks should get dirty because they should be used and your staff want to focus on their work and not clearing up after themselves. So there is no shame in these - although they did perhaps leave it a bit too long before calling us in.
So, if you want to see what we see, here are photos taken over the last couple of years. This is way more common than you would think.
Every one of these PCs and telephones looks like new when we had finished, ready to last a good few years more.
Hooray for long lasting plastic. Twice yea minimum will prevent them getting this bad though.
BEFORE AND AFTER TECHCLEAN
Dust and dirt and germs build up in the grooves. We get it all clean, right down in the gaps with our special brushes, but without electrocuting ourselves or shorting out the keyboard.
Mice gather gunge in the cracks, we get it all out. Moisturiser and even hand sanitiser can make it worse
Imagine starting a job and taking over someone else's desk and being given this. Back like new now.
This is just typical 6 months worth of dust but a basically clean keyboard.
And people put these to their face.