Hi all!

When cleaning my matrass with bleach-containing washing agent, I used way to much water. For three days I accidentally left the matrass on my varnished pinewood floor, all the while leaking the watered-down washing agent into the floor (please don't laugh). Moreover, I tried to dry the stain with washing soda/soda crystals... I quickly removed it after 10 minutes but it still made a salty layer on top of the stain. I washed off the salt and let the stain dry.

Now I have a light-colored stain with dark sports on my floor of about 4 feet wide. (The image won't load, so I'll provide the links:

http://imgur.com/7ZxDdr6
http://imgur.com/0oK7tbm
http://imgur.com/BD1zucz

What should I do? Should I sand it and rework the varnish, swap floorboards or try some other solution?

Any advice is welcome and much appreciated!