If you have a PVC vertical or roller blinds it can often get scuffed and we often get asked how to remove those marks. We would normally recommend you try and gently wipe with a slightly damp cloth but its also possible to use a soft white eraser. Please go gentle with the eraser as it could also rub through the pvc finish.
If its a vertical slat worst case you could also turn the vein around or position it somewhere along the rail where its not so sightly. It is however possible we can provide just the vein but depends on the age of the veins as over the years the veins colour will over time fade so you also dont want fresh vein standing out.