Hello Alan
This will depend what is cauing the yellowing.
On cream suites it is often caused by sunlight damage and the pigment has been damaged by the UV rays. If this is the case then cleaning will not restore it and it would need to be recoloured and finished to get it back to its former glory.
The other possible cause is dye transfer from clothing, throws etc. If this is the case then cleaning with LTT Maxi Cleaner may help as this is specifically designed for this problem. If this did not remove the dye transfer completely it would then need to be recoloured and refinished.
If you do not do restoration work then it is better to pass on a job like this as cleaning alone is very unlikely to rectify the job completely.
If you need someone to pass it to someone else we can refer the job out on your behalf and earn a %age for you.
Give us a ring if you need any further advice on this.
Cheers
Judy