preseasoned pan - now blackened and chipping
Try to use vinegar in the hot pan to remove solids of food. Also, adding salt while washing and brushing helps removing that heavy duty dirty.

After that, gently dry the pan in the stove and add oil just after all the water evaporates. Use a paper towel to help evenly spread the oil.

Then put the pan back in the stove or oven in a low fire.

That's what I do.