All right, so this is where the magic happens: I tried to remove the excess of oil paint from the panel wash (mind you - its more than 36 hours later!) and guess what: it works ! ! !
I never tried this technique before and I am stunned how good it works.
Just compare the pics from yesterday with those I made just a couple of minutes ago.
Thanks to the gloss varnish before adding the panel wash, I could simply rub off all excess of oil paint wash with an old cotton cloth onto which I applied some turpentine.