I suggest:
1)K98kwith laminated stock
Either leave it alone, or remove the non-original varnish and oil it. Do not use caustic soda or similar ("oven cleaner").
2) Lee Enfield No4Mk1
Was not "blued". Metal was parkerized and then painted with Suncorite. Search for "Suncorite" in the L-E forum and you will find out all about it!
3) Probably shellacked. If your rifle has very tatty shellac, it may be simplest to just wash it off with alcohol ("denatured spirits" or "methylated spirits) and oil it. If you are very careful, you can polish out scratches in the shellac by using alcohol to soften the affected area and then polishing it dry. Warning: if you have never done shellac polishing before, don't use your rifle to experiment on! Practice on a piece of hardwood first!