Ironically: toilet paper.

It looks suspicious a.f., I grant you, but even when I had a desk job in an office, I’d have a toilet roll in easy reach on my desk for use on spillages - drink spillages - and for wiping my fingers and face if I was eating and needed to use the computer or to answer the phone. Also for blowing my nose, but I’d try to leave the room with enough in hand to do that so I wasn’t subjecting people to that unmistakeable noise.

I buy the cheapest TP the supermarket sells. It’s generally cheaper than most other paper products and works just as well.

Not terrible for it’s original purpose either, but I prefer something slightly better quality for that.