das Shampoo
shampoo
A liquid or creamy substance used for washing hair.
Ich muss neues Shampoo kaufen, die Flasche ist fast leer.
I need to buy new shampoo; the bottle is almost empty.

shampoo
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shampoo
A liquid or creamy substance used for washing hair.
Ich muss neues Shampoo kaufen, die Flasche ist fast leer.
I need to buy new shampoo; the bottle is almost empty.

'Shampoo' is often the second part of compound words that describe the purpose or type of the product more precisely. Examples are 'Trockenshampoo' (dry shampoo), 'Anti-Schuppen-Shampoo' (anti-dandruff shampoo), or 'Kräutershampoo' (herbal shampoo).
Für die Reise habe ich mir ein Trockenshampoo gekauft.
I bought a dry shampoo for the trip.
When talking about a specific bottle or type, an article is used. When talking about the substance in general, especially after prepositions, the article is often omitted.
Kannst du mir bitte das Shampoo geben?
Can you please give me the shampoo?
Common verbs used with 'Shampoo' are 'benutzen' (to use), 'verwenden' (to use), 'kaufen' (to buy), or in the phrase 'sich die Haare mit Shampoo waschen' (to wash one's hair with shampoo).
Welches Shampoo benutzt du für deine Haare?
Which shampoo do you use for your hair?
soap
'Seife' and 'Shampoo' are both products for washing and cleaning. The main difference is the part of the body: 'Seife' is usually used for hands or the body, while 'Shampoo' is used for hair. Both can be liquid, so they are easy to confuse, especially in the bathroom or when shopping. When it is about hair, 'Shampoo' is natural. When you wash your hands or body, you usually say 'Seife'.

Nach dem Schwimmen wäscht sie ihre Haare mit Shampoo.
After swimming, she washes her hair with shampoo.
Im Bad liegt eine neue Seife für die Gäste.
There is a new bar of soap in the bathroom for the guests.