I did apply 303 protectant via the wipes but the first drop of grease stained it immediately. Maybe I didn't apply enough protectant?
Possibly. I have never used the wipes. I use the spray bottle and apply it pretty heavy, letting it soak in. Sometimes, two applications. Applying it with the table in the shade helps. It is a water based product and will evaporate quickly if applied in the sunlight and heat. After a couple of hours, I wipe it down and buff it lightly with a clean, dry rag. It does have to be reapplied occasionally, especially if you do not use a cover on the BBQ.