Does he need to get the right coloured can first?Try some petrol on it.
Get new seat. I have many of the hard plastic type in white and they last for a life time as do their plastic fixings. They are like new after bleached.
Saw it off then grind it off. If you have no tools, then you are stuck. In that case, get a pro, who will saw it off then grind it off.Trying to get the old one off as per thread title etc..
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