Cleaning very grubby floor boards

I'm trying to clean up some floor boards to assess their suitability as an exposed floor surface. They're pretty ingrained with what I guess is plaster dust, blobs or artex and assorted grime. A belt on my sander will clean about 6" square before losing all its abrassiveness, it's not just clogging. Any suggestions for any kind of pre sanding treatment, or do I need to bulk buy some more sanding belts?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

What sort of sander are you using? You need a large drum sander (i.e. weighs a ton, looks like a huge upright vaccum cleaner and takes paper as coarse as 24 grit. Not the sort of thing that is owned, but frequently hired.
Christian.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Christian McArdle wrote:

A belt sander. With 60 grit belts. It's only for about 2 metres square. Will the big beast really clean that much better?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.