Where can i get my DELL LAPTOP refurbished ? I reside in Stoke Newington Hackney london !?

i live in stoke newignton hckney london and i need to know anywhere close to where i live can i get my DELL XPS M1530 refurbished for myself? i have no warranty or nothing on it, i just want it cleaned up very nicely, nothing internal i.e Hard Drive Ram, but the actual dirt and all that stuck in it - i have tried 200% to clean it up myself but it is just not possible, any ideas, thanks !