We have an oil fired boiler that had a very slight weep on the fuel supply and it soaked into the concrete floor. Now we are at a loss on how to rectify the situation - if the doors are left closed for any length of time then the smell is not nice, not overpowering, but certainly unpleasant.
We have scrubbed the affected area repeatedly but the small returns. I am wondering if we seal the concrete whether this is the right approach - we really do not want to dig the floor out. If we were to seal the affected area of the floor what preparations should we do to ensure the seal takes to the concrete and what sort of sealant should we use? In my fantasy world I would degrease with something like methylated spirits - ensuring that there was no build up of those fumes - and then pour a liquid sealant over the area which would then cure to a hard, sealed surface and hey presto, no smell of diesel.