RSS2 Feed Contribution

[andreitero]

Hello, i'm having some trouble validating my feed. Apparently the New Products feed is valid, but the Specials and All Product feeds are not valid because there is a duplicate guid value:

<guid isPermaLink="true">http://lemy.co.uk/dunlop-gents-standard-mountain-bike-p-45.html</guid>

These are my feeds:
http://lemy.co.uk/index.php?main_pag...&feed=specials
http://lemy.co.uk/index.php?main_pag...&feed=products
http://lemy.co.uk/index.php?main_pag...d=new_products

Can anyone help me fix this?
Thanks!

Update:
Apparently, something is wrong with that particular page on my website as it is duplicating in the rss feed and thus creating the double guid tag, which is the reason my rss feed is not valid. I have turned that page upside down and can't figure out what's wrong with it and i would hate to lose it because it is ranking on the first page on google uk for 'dunlop mountain bike'. I have searched for blank spaces using the scrip provided by andrew(thanks) and removed them. Anyone has any idea how to prevent that duplication without removing my page?
http://lemy.co.uk/dunlop-gents-stand...bike-p-45.html