Hi,
Well, there are various issue that can cause painful intercourse and penetration for a woman. To try to determine what the cause is, you should consider using the process of elimination; start with eliminating the VWash first. She may be experiencing irritation from the chemicals in the VWash. A woman's vagina doesn't necessarily need chemicals to keep it clean, in fact rinsing with very warm water works just fine. There's also plenty of homeopathic remedies to research online, for a more natural approach to vaginal cleansing. Your wife can google 'Natural Remedies For Feminine Health' for more information.
Other issues that can cause painful sex can include: vaginal dryness, lack of sexual arousal, vaginismus, anxiety, endometriosis, and so on. Meanwhile,the best thing that you can do is to be patient with your wife, and be supportive of her. Best of Luck