I have been a somewhat loyal fan of kroil for years,also like in this order -from spray products one called 'nuts off',PR blaster,presto, then the also ran products and at the bottom of the list comes liquid wrench and WD-40 ,the last two aren't worth bringing home.
Last fall I had a new hardware salesman in from a co called kimball-midwest, he touted his flavor of penetrating oil ,so I bought some . Turns out to be as good as kroil or better. I am a hard sell and this product has done it. It is a thinner product and much less stinky ,also leaves much less mess.