youll have to get the kep cut which means you have to take the spring out dont worry i thought i broke it but i didnt put it back in the button thing ad then put the top back on and twist the top case around once or twice until it gets its 'flip' back should make sense when you take it apart plus you need to take the little black chip out which is in the old key case, just clips out and put it in sideways in the little gap so it stays there (in the new case under the top bit you have to take off when getting the key cut) took me about 5 mins after getting blade cut its really easy
try the halfords high foam cleaner , its only £4.50 or somthing but its brilliant mayte .. in my gf's old cc she has cloth seats and thats what i used on it untill she got her new one