Use a triangular brush with a towel make sure the vapour pressure is on low.  Hold a folded second towel, in your “off” hand. On some single-ply draperies the stain will usually go through and be shown on the towel.

Sheers or One-Ply Fabric

If the drape is soiled, then lightly mist. Use a gently detergent. (Don’t wet the fabric) Use the triangular brush on one side of the pleat at a medium pace (about 100cms per second) from the top of the drape to the bottom, moving with another towel against the back of the drape at the same time. The steam vapour will go through the fabric and remove dirt from both sides simultaneously.

Insulated or Multiple-Layered Fabric

Same technique as for single-layer but be extra cautious about moving too slowly.  If you are cleaning insulated draperies, since the insulation is generally heat sensitive, it’s better to go over the surface twice at moderate speed than once at low speed.

Horizontal Blinds

If they have a lot of accumulated “crud” on the surfaces, pre-spray the blinds with a mild detergent that you have thinned out 3:1 with water. Use nozzle with no brush. Use open steam vapour on a medium or high pressure.  This will enable loose dirt and dust to be removed off the surface.

Change to triangular brush with towel. Then close the blinds with top of slats facing you, steam vapour should be on a low pressure.  Brush side to side from the top down. Close the blinds from the opposite direction and clean with a side-to- side movement from the bottom up.
Without opening the blind, remove it from its bracket and turn it so it now faces the wrong direction.  Put it back in its bracket and clean from the top down again. (This will ensure that you have covered 100% of the slat surfaces).

Tip: For blinds, which have lots of mildew, spray the slats with a detergent that contains bleach before you commence.

Vertical Blinds

Triangular brush with towel on a low steam vapour.  Open the blinds then begin at the top of each slat. Hold a towel in your opposite hand against the back side of the slat and move smoothly downward with the triangular brush on the front side. Switch hands and repeat on the opposite side of the slat.

Caution: Too much heat may damage vinyl blinds. Consider replacing rather that cleaning them?

Other Things Steam Will Clean

And the list goes on