My dining chairs are covered with a light coloured material which is now really grubby. We have had them professionally cleaned before and need to do so again but I just wondered if anyone could recommend an effective stain remover that will get them at least looking better. They are old and we plan to replace them but are having a get together and would like them to look presentable for that. Would bleach work, not bothered if the colour changes as long as they look cleaner.