It occurs to me that the future recipients of my hand knits may not be sure how to care for their new items. Although I always include a care instructions card with my gifts, I know they can be easy to lose. Here are some tips that I wrote for 
another article that can help you keep your hand knits looking new for a lifetime. 
 
Wools (fiber from sheep and other animals)
Wools are a particularly dangerous yarn to give to non-knitters as it 
has a tendency to felt when washed. Felting is the process by which 
agitation and/or heat cause the tiny fibers in the wool to latch onto 
each other tightly. This causes the fabric to shrink and become denser 
and stiff. Fortunately, washing wools is as simple as soaking the 
garment in lukewarm water with a small amount of detergent. It is OK to 
swish the item around a bit, but do not rub the fabric against each 
other. 
After you are satisfied that the garment is clean enough, drain the 
water and fill the sink back up with cool water. Repeat this until you 
no longer see suds. Next, gently wring the water out as best you can and
 then lay the item flat out on a towel to dry. Once it is dry, inspect 
the item to see if it has "grown" at all. If it seems a bit stretched 
out, put it into the dryer on low heat and run it through part of a 
fluff cycle. Check it every few minutes to make sure there is no 
evidence of felting or shrinkage. 
There is one type of wool that can be machine washed with no worry. It
 is called "superwash wool" and is God's gift to knitters. The term 
"superwash" refers to a treatment that the wool is subjected to that 
prevents the tiny fibers from latching onto each other. The best way to 
care for superwash wool garments is to wash the item in the washer on 
the gentle cycle. Then lay it out flat to dry. 
Cottons
Cotton is a wonderful fiber to use for hand knits. It's breathable, 
natural, comes in tons of colors, and is quite durable. Many cotton hand
 knits can be machine washed on the gentle cycle inside a lingerie bag. 
Be sure to use cool water as cotton does have the propensity to shrink. 
As such, the best method for drying the garment is to lay it out flat on
 a towel. Similar to wools, if the garment feels stretched out after 
washing, it is alright to put it in the dryer for 15 minutes on low heat
 to fluff it up. 
Synthetics
Yarns are made in a huge variety of fiber content and design, and as 
such, there is no one-size-fits-all method for laundering. The best way 
to safely launder synthetics is to use the hand wash and lay flat to dry
 method as directed for wools. If you feel the fiber and garment are 
sturdy enough to be put in the washer, do so, but take care to wash it 
on gentle cycle with a mild detergent. As always, lay the garment out 
flat to dry. 
Other Tips and Tricks for Preserving Your Hand Knits
- Don't ever hang a hand knit sweater on a hanger as it will cause it to stretch
- Keep wool away from cats. Many cats are attracted to the wool and may try to eat it.
- If you are worried that your detergent is too harsh, consider giving Eucalan a try.
- Do not use bleach - EVER!