The five silences, one at a time
On this page10
Water temperature is the first
The label must state whether the product should be washed by hand or machine, and must state a water temperature in terms such as cold, warm or hot. Unless hot water up to 145 degrees F does no harm, in which case no temperature need appear.
Drying temperature is the second
If machine drying is called for the label must state a drying temperature. Unless regular use of a high temperature will not harm the product, in which case the temperature may be left off. Tumble dry on its own means high, medium or low may be used.
Ironing is the third and it has an extra condition
Ironing must be mentioned only if it is needed on a regular basis to preserve the appearance, or if a warning requires it. If it is mentioned, a temperature must be stated, unless a hot iron does no harm.
Bleaching is the fourth and it is written as three branches
If all commercially available bleaches can safely be used on a regular basis, bleaching need not be mentioned. If all of them would harm the product, the label must say no bleach or do not bleach. If chlorine bleach would harm it but non chlorine bleach would not, the label must say only non chlorine bleach, when needed.
That middle branch is the interesting one
It is the only one of the five where the rule prescribes the words. The other silences are permissions; this is a mandate with a script.
Drycleaning solvent is the fifth
A drycleaning instruction must state at least one type of solvent that may be used, unless all commercially available types can be used, in which case no solvent need be named.
And it comes with two forbidden words
The terms drycleanable and commercially dryclean may not be used in an instruction. A rule that names two specific phrases and bans them is rare across this library.
Read the five together and a bare label is a strong claim
Machine wash, tumble dry, with no temperatures, no bleach line and no solvent named asserts that hot water, a high dryer setting, a hot iron, every commercial bleach and every commercial solvent are all safe.
Which is more than most short labels look like they are saying
The brevity reads as the manufacturer having little to say. Under this part the brevity is the manufacturer having said the most permissive thing available.