You know what it is. The deep bit of dashboard in front of the steering wheel awash with old bills, probably unpaid, empty fag packets ( that’s cigarette packs to anyone outside the UK ) , old takeaway wrapping and detritus. In some cases the vehicle is relatively new and the purchase date can be probably ascertained by digging deep and finding the invoice for it deep in the dashboard. Poor chap never has the time to clean it out as he’s off to the next job, not yours, to try and make headway on it before he finishes at 3.00 to get down to Witherspoons. He’ll need to trade it in before too long as driver visibility may be impacted.
If you intend to employ a builder avoid one with builder’s dashboard. He might not turn up anyway, and if he does he won’t finish the job, unless you pay cash up front and even then he might have better options.