can anyone pleaseeee help..my problem is with the sewage smell which comes out from the soil pipe behind the wc..the toilet is on the 3rd floor of a newly built (3years old....warranty ran out last year) town house. i have tried pouring gallons of jeyes fluid down the drain and not to mention every conciable detergant available on the market..to no avail i have also checked for blockages..there doesn't seem to be any