His first attempt at doing his own hair was, to put it bluntly, disastrous. During his earlier days, his carers would manage his hair for him, cutting it according to Albert's style and using specific brands of shampoo and conditioner when necessary. Zeno tended to get messy, a lot, frequently requiring showers to cleanse his hair of blood and accumilated debris from rushing around so much.
This lasted about a year or so before he started rebelling. He'd tired of looking so much like Albert, finding scissors to crop his hair himself, butchering the sides which ended up a messy business. His superiors were greatly displeased but allowed his handlers to trim his hair according to his wishes, cutting the sides neatly so he still resembled their chosen. Zeno enjoyed frequent grooming, liking showers twice a day if he could get it during busier periods. It washed off the scents he'd accumilate during the day and a shower at both the start and end of day suits him well.
Washing it twice a day, using expensive shampoos and conditioners with scents he finds pleasing is his usual go-to. Once a month he might have his sides trimmed down so they grow too far out back into the full style Albert is known for. Hair gel is not Zeno's thing however - it's far too sticky and greasy for him to tolerate, making him want to wash it out. He can do it himself and eventually did but for a while, it was nice letting others do that for him.