I have bid on something by mistake it still has 4 days to go can i withdraw my bid or remove total

I have bid on something by mistake it still has 4 days to go can I withdraw my bid or as i have also put a higher price I could still auto bit if I cant cancel my bid could I remover the higher bid, Thanks in anticipation G

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Ask the seller if they will cancel your bid. 

 

Alternatively here's the link for bid retraction butr there are conditions attached.

 

https://offer.ebay.co.uk/ws/eBayISAPI.dll?RetractBidShow