[Grammar] ‘covered with’ VS ‘covered in’

[northpath]

These are two sentences with ‘covered in’
‘Patrick's boots were covered in mud.’
‘The dinner plates were covered in grease.’
But some day I came across a sentences (don’t remember where)
‘The furniture was covered with dust.’
I think it’s incorrect because to my knowledge the preposition with is used when somebody covers something deliberately. For instance
‘I brushed and covered the rusty metal surface with grease.’

 

[bhaisahab]

You can use either 'with' or 'in'.

 

[jutfrank]

I agree with northpath that in is the best choice here, for the reasons given.