Why one trolley cannot cover the whole building
Workshop soil is oily and abrasive. It bonds to a cloth and then travels. A cloth that has wiped a bench near a service bay carries a film that will smear across a display panel and be visible under showroom lighting the next morning. No amount of care in the wiping motion fixes that, because the problem left the workshop on the cloth rather than in the technique used at the counter.
The reverse matters too. A soft microfibre intended for polished glass is destroyed in one pass across a grit-covered bench, and then it is a poor glass cloth for the rest of its life. Separating equipment is not fussiness. It is the cheapest way to stop each area degrading the tools that serve the other, and it makes both jobs faster. Two sets of equipment cost less than one ruined display panel and the conversation that follows it.
