Self Leveller For Tiling - Old Vinyl Tiles

[tododo]

Hi all

Ive take up really old vinyl floor tiles that were here when we moved in (in the kitchen) - god knows how longs theyve been there.

The tile came up ok but left a glue type substance on the the original tile underneath from when the house was built im guessing

I need to level the floor with a self leveler but not sure what would stick to this hard type glue - its impossible to get off really

We are then planning to tile directly on the levelled floor

Thanks for any advise