For my 2 cents on this, if I get something like this I would tell the customer I can get dirt off the window, but I'm not insured for specialist stain removal. If I scratch the glass or damage the seal with chemicals as I try to remove the stains, (I suspect) my insurance won't cover it.
I wouldn't be faffing around with different chemicals that cost me, but might not even work, and I CERTAINLY wouldn't feel confident about using abrasives such as Pink Stuff on it. At the end of the day, the customer is unlikely to pay you relative to your effort (think of time researching, time spent procuring cleaning materials, extra time on the job). You won't get paid much more, if anything, and the risk of a big payout if you knacker the window would surely make it uneconomical - even if you get it right 99 times out of 100, there's still a big compensation to pay on the 100th. You might get a bit of a customer loyalty bonus too, but I'm not sure that counts for a massive amount these days - either a customer is happy to continue employing you or not (as DS said, companies are running 4 vans when they aren't even doing the job properly).
BTW, it's not that I don't care, I do my best to do a good job. Ultimately though, I'm not doing this for my friends or for fun, it's my business and livelihood. Therefore if something is going to cost me significant time and energy which I'm not going to get paid for, and I'm taking the risk that it will bite me in the butt and cost me a significant amount if it goes wrong, why would I do that voluntarily? And then I'd have to do the same again in the next month or 3 anyway!
Just my thoughts.
I wouldn't be faffing around with different chemicals that cost me, but might not even work, and I CERTAINLY wouldn't feel confident about using abrasives such as Pink Stuff on it. At the end of the day, the customer is unlikely to pay you relative to your effort (think of time researching, time spent procuring cleaning materials, extra time on the job). You won't get paid much more, if anything, and the risk of a big payout if you knacker the window would surely make it uneconomical - even if you get it right 99 times out of 100, there's still a big compensation to pay on the 100th. You might get a bit of a customer loyalty bonus too, but I'm not sure that counts for a massive amount these days - either a customer is happy to continue employing you or not (as DS said, companies are running 4 vans when they aren't even doing the job properly).
BTW, it's not that I don't care, I do my best to do a good job. Ultimately though, I'm not doing this for my friends or for fun, it's my business and livelihood. Therefore if something is going to cost me significant time and energy which I'm not going to get paid for, and I'm taking the risk that it will bite me in the butt and cost me a significant amount if it goes wrong, why would I do that voluntarily? And then I'd have to do the same again in the next month or 3 anyway!
Just my thoughts.
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