Bathroom floor residue

[tas114642]

Hi All,

I had a bathroom refurb done on our first floor bathroom last year. It has vinyl planks fitted on MDF, over timber trusses with the garage below. I noticed the attached image with residue appearing between a gap. To the left is the WC, to the right the shower and the top boxing is the SVP so I don't think there are any pipes under there. Does this happen with flooring or is something seriously wrong?

Thanks for any help.

 

[motorbiking]

Its possible that the glue the installer has used is being drawn out due to water.

 

[foxhole]

May have used too much adhesive , try wiping with lighter fuel , will dissolve most types of adhesive.(unless it was water based).