Bamboo kitchen bench problem

My daughter and son in law bought a house in Gladstone last year. The kitchen had been renovated with the benches finished with bamboo tops.

The bench top finish is unknown but it is slightly tacky in places and is not a desirable finish. If a loaf of sliced bread is left on the surface the plastic leaves a mark that is hard to remove

I think it may have been an oil finish.(not sure).

Any ideas on how can we fix this problem?