From Spotlight's Venetian Blinds Website,
Not Bleaching I might understand but "Do not Iron/ Tumble Dry"

Windowshade 50 mm Alabaster Faux Wood Venetian Blind

Composition Metal, Plastic & Wood
Contents 1 Bracket Set, 4 Bracket Screws, 2 End Caps, 1 Plastic Cleat.
Dimensions 60 cm width x 150cm drop.
90 cm width x 150cm drop.
120 cm width x 150cm drop.
150 cm width x 150cm drop.
180 cm width x 150cm drop.
210 cm width x 150cm drop.
60 cm width x 210cm drop.
90 cm width x 210cm drop.
120 cm width x 210cm drop.
150 cm width x 210cm drop.
180 cm width x 210cm drop.
210 cm width x 210cm drop.

Washing Instructions Wipe with damp cloth.
Bleaching Instructions Do not bleach.
Drying Instructions Do not tumble dry.
Ironing Instructions Do not iron.